The UI now turns these on by feature on Android as well as iOS:
- widgets, widgetTrips and the travel day (liveActivity) write the same
snapshot to the Android app's Glance widgets; the travel day also sends
the next stop's minutes and the stops' colours for the Live Update.
- geolocation answers navigator.geolocation from the app's location stream.
- tileCache: Android keeps Mapbox's resources in its WebView client, so the
map is offline-capable there too, without the iOS trek-tile:// rewrite.
- playBilling: the purchase client buys through Google Play on Android,
with the purchase token as the receipt the control plane verifies.
- googleWallet: a booking's button adds it to Google Wallet on Android,
through the save link the server asks the TREK services for.
WKWebView runs no service worker for a self-hosted server, so on iOS nothing
kept a map tile once it scrolled away. Binaries with the tileCache feature
answer a trek-tile:// scheme from a store on disk: a tile viewed once is
served from there for up to 30 days (Mapbox's limit for a device cache,
applied to every provider), then fetched anew; the store keeps under 250 MB,
dropping the least recently used tiles first, sends a unique app User-Agent,
and never prefetches. Mapbox's own resources (style, tiles, glyphs, sprites)
and Leaflet's raster tiles go through it, telemetry never does.
Offline, a Mapbox map in such an app now stays Mapbox where it was viewed,
and the pill offers the stored trip region instead. The offline settings
show what the store takes against its limit, with a way to empty it.
Maurice